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Hydrogen effect on compression mechanical properties of TiNb alloys at elevated temperatures

机译：高温下锡合金压缩力学性能的氢气作用

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The study of this work was focused on the hydrogen effect on hot deformation behavior of hydrogen charged TiNb based alloys at three temperatures in comparison with non-charged specimens. The Ti24Nb and Ti26Nb (at.%) alloys were heat treated by three step regime in argon or hydrogen atmospheres. The hot compression tests were performed on a Gleeble 3800 machine at 800, 750 and 700°C with compression strain of 5x10~(-3) s~(-1) and deformation degree of 50 %. The microstructure resulting from heat treatment as well as from isothermal compression test was analyzed using optical and scanning electron microscopies. Measurement of microhardness revealed that higher microhardness values for Ti24Nb after thermo-hydrogen treatment corresponded to fine grained microstructure and strengthening by grain boundaries. Hydrogen contents determined using LECO RH600 analyzer showed that Ti26Nb contained higher amount of hydrogen due to the stabilization of beta phase by higher Nb concentration. Based on the hot compression test results, the plasticity at elevated temperatures was evaluated. The evolution of uniaxial compressive test curves showed the stabilization of flow stress due to the hydrogen for high deformations at lower temperatures. The differences in hot compression behavior for both niobium contents on the one hand and for hydrogen charged and non-charged specimens on the other hand were observed.
机译：该作品的研究专注于与非充电样本相比，在三个温度下对氢气电荷的合金的热变形行为的氢气效应。 Ti24NB和Ti26NB（AT。％）合金在氩气或氢气中的三个步骤制度进行热处理。在800,750和700℃的GLEEBLE 3800机器上进行热压缩试验，其压缩应变为5×10〜（-3）S〜（-1），变形度为50％。使用光学和扫描电子显微镜分析由热处理和来自等温压缩试验产生的微观结构。微硬度的测量揭示了热氢处理后Ti24NB的较高的显微硬度值对应于细粒微观结构并通过晶界强度强化。使用LECO RH600分析仪测定的氢气含量显示Ti26NB由于β相通过较高的Nb浓度稳定β相含有较高量的氢。基于热压缩试验结果，评价升高温度下的可塑性。单轴压缩试验曲线的演变表明，由于氢气在较低温度下的高变形而稳定流量应力。观察到一方面铌含量和另一方面的氢气含量的热压缩行为的差异，另一方面被带电和非充电的标本。

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